Premium
Soluble flagellin coimmunization attenuates Th1 priming to Salmonella and clearance by modulating dendritic cell activation and cytokine production
Author(s) -
FloresLangarica Adriana,
Bobat Saeeda,
Marshall Jennifer L.,
YamPuc Juan Carlos,
Cook Charlotte N.,
Serre Karine,
Kingsley Robert A.,
FloresRomo Leopoldo,
Uematsu Satoshi,
Akira Shizuo,
Henderson Ian R.,
Toellner Kai M.,
Cunningham Adam F.
Publication year - 2015
Publication title -
european journal of immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.272
H-Index - 201
eISSN - 1521-4141
pISSN - 0014-2980
DOI - 10.1002/eji.201545564
Subject(s) - tlr5 , flagellin , priming (agriculture) , biology , microbiology and biotechnology , antigen , in vivo , t cell , cytokine , immunology , immune system , innate immune system , toll like receptor , receptor , biochemistry , botany , germination
Soluble flagellin (sFliC) from Salmonella Typhimurium (STm) can induce a Th2 response to itself and coadministered antigens through ligation of TLR5. These properties suggest that sFliC could potentially modulate responses to Th1 antigens like live STm if both antigens are given concurrently. After coimmunization of mice with sFliC and STm there was a reduction in Th1 T cells (T‐bet + IFN‐γ + CD4 T cells) compared to STm alone and there was impaired clearance of STm. In contrast, there was no significant defect in the early extrafollicular B‐cell response to STm. These effects are dependent upon TLR5 and flagellin expression by STm. The mechanism for these effects is not related to IL‐4 induced to sFliC but rather to the effects of sFliC coimmunization on DCs. After coimmunization with STm and sFliC, splenic DCs had a lower expression of costimulatory molecules and profoundly altered kinetics of IL‐12 and TNFα expression. Ex vivo experiments using in vivo conditioned DCs confirmed the effects of sFliC were due to altered DC function during a critical window in the coordinated interplay between DCs and naïve T cells. This has marked implications for understanding how limits in Th1 priming can be achieved during infection‐induced, Th1‐mediated inflammation.